65
Commands
$PASHQ,DTM,[c]
The associated query command queries the current datum, where c is the optional
port designator for the output of the response. If a port is not specified, the receiver
sends the response to the current port.
$PASHR,DTM
The response is in the format:
$PASHR,DTM,s*cc
s is the 3-character string, listed in Table 4.13, which denotes the current datum
setting.
DUG: GPS/UTC Time Difference
$PASHQ,DUG,[c1]
This command allows you to query the time difference between UTC time and GPS
time, where c1 is the optional port designator for the output of the response. If a
port is not specified, the receiver sends the response to the current port.
$PASHR,DUG
The response message is output in the format:
$PASHR,DUG,<Binary Data String + Checksum>
Table 4.15 defines the DUG binary data string parameters.
A time step, or leap second, was added to UTC on 12-31-98. GPS time was not physically adjusted,
and is now thirteen seconds ahead of UTC. The time change is reflected in the navigation messages
generated by the individual satellites as of January 1, 1999.
Table 4.15. $PASHR,DUG Binary Data String Format
Binary Type Size Content
unsigned short 2 Reference week
unsigned short 2 Reference time
unsigned short 2 GPS-UTC time (seconds)
unsigned short 2 GPS week number when the last leap second was added to GPS time
unsigned short 2 Julian day number when the last leap second was added to GPS time (1 to 365)
unsigned short 2 GPS-UTC time difference after correction (seconds)
unsigned short 2 Checksum (word)
Total bytes 14
G12RevD.book Page 65 Tuesday, April 2, 2002 4:33 PM
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